Single-phase pouring type combination measuring dry transformer

Abstract

The invention relates to a single-phase pouring type combination measuring dry transformer. The single-phase pouring type combination measuring dry transformer comprises a resin case, a current transformer and a voltage transformer, wherein the current transformer is arranged at the upper part of the left end of the resin case; the two terminals of the primary coil of the current transformer are respectively connected to two conducting rods vertically arranged at the left end of the resin case; the voltage transformer is arranged at the lower part of the right end of the resin case; the primary winding of the voltage transformer is connected to any terminal of the primary coil of the current transformer in the resin case; the secondary winding of the voltage transformer is connected to a plug column vertically arranged at the upper part of the right end of the resin case; the winding direction of the primary coil of the current transformer is parallel to the winding direction of the primary winding of the voltage transformer. The single-phase pouring type combination measuring dry transformer is simple in structure, convenient to produce, small in occupied space, large in creep distance, uniform in electric field distribution and high in measuring accuracy, has higher dynamic thermal stability and better overcurrent resistance, and can be suitable for being used in a high-pollution and high-altitude environment.

Description

technical field [0001] The invention relates to a transformer, in particular to a single-phase pouring combined metering dry transformer for high voltage measurement or relay protection. Background technique [0002] Most of the existing outdoor combined metering transformers use transformer oil or indoor resin-coated silicone rubber sleeves for composite insulation. Among them, transformer oil is easy to leak, has a large volume, and is not easy to maintain. The other uses indoor resin-coated silicone rubber. The outer insulation of the composite insulated transformer mainly depends on the jacket made of silicone rubber, but the hydrophobicity of silicone rubber products will decrease, electric corrosion, pulverization, and cracking after long-term use; coupled with the bonding of two insulating media, it is easy to The existence of air bubbles will cause serious consequences such as tracking, transformer insulation breakdown, and explosion. Most of the existing outdoor co...

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Problems solved by technology

[0002] Most of the existing outdoor combined metering transformers use transformer oil or indoor resin-coated silicone rubber sleeves for composite insulation. Among them, transformer oil is easy to leak, has a large volume, and is not easy to maintain. The other uses indoor resin-coated silicone rubber. The outer insulation of the composite insulated transformer mainly depends on the outer insulation made of silicone rubber, but the hydrophobicity of silicone rubber products will decrease, electric corrosion, pulverization, and cracking after long-term use; coupled with the bonding of two insulating media, it is easy to The presence of air bubbles will cause serious consequences such as tracking, transformer insulation breakdown, and explosion

Most of the existing outdoor combined metering transformers are installed on the same horizontal line as the current transformer coil and the voltage transformer coil, which is bulky and wastes a lot of materials. In addition, the primary coil of the current transformer and the voltage transformer coil are arranged horizontally, and the electric field intensity is concentrated. Amplification, the magnetic field generated by the primary current of the current transformer has an impact on the voltage transformer, resulting in low accuracy or out-of-tolerance errors

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